Experimental Study of Falling-film Mode Transitions between Horizontal Tubes in CaCl_2/Water Absorber  

作　　者：XU Zhen SUN Wenqian LU Yuan XIAO Yunhan XIE Yingchun 

机构地区：[1]Key Laboratory of Advanced Energy and Power,Institute of Engineering Thermophysics,Chinese Academy of Sciences [2]Research Center for Clean Energy and Power,Chinese Academy of Sciences [3]School of Engineering,Ocean University of China

出　　处：《Journal of Thermal Science》2014年第4期338-345,共8页热科学学报（英文版）

基　　金：Financial support by the National Natural Science Foundation of China(No.51006105)

摘　　要：It is important to accurately predict the flow mode especially intertube falling-film mode of absorbent for its great impact on the heat and mass transfer in a horizontal tube absorber. In this paper, a test facility used to study falling-film outside horizontal tubes was built, and experiments were conducted to explore the intertube mode transi- tions with water-calcium chloride （CaC12/water） solution in quiescent surroundings. The correlations which are more suitable for predicting CaC1jwater solution intertube mode transitions were developed. In general, the transitional Re will decrease with the solution concentration increasing, and its effects increase with the transitions from droplet mode to sheet mode. Hysteresis exists in all the mode transitions, and it is more obvious for low concentration solutions. The results may be an important support for modeling, designing and operating of CaC12/water falling-film absorber.

关 键 词：horizontal tube mode transitions water-calcium chloride solution CORRELATIONS 

分 类 号：TK124[动力工程及工程热物理—工程热物理]